What values should I use for light paths?
There is no works-for-everybody setting. Basically it's a trade-off between render speed and image realism.

I would suggest to turn down each number of bounces to 0, just so you see what happens then. Then start increasing one of the numbers, and see how it affects your image. The aim is to keep the numbers as low as possible (to get a fast render) while keeping them high enough so that the image looks the way you want it to.